Large-diameter anti-corrosion steel pipe automatic spraying machine and working method thereof

Abstract

The present application discloses an automatic spraying machine for large-diameter anti-corrosion steel pipes and a working method thereof, comprising a base frame, a guide rail, a spraying mechanism, an air blowing device and a walking mechanism, wherein the base frame is provided with two groups of symmetrically distributed brackets, which are rotatably connected to rollers, and the two rollers jointly support a horizontally arranged steel pipe body, and the axis of the roller is parallel to the axis of the steel pipe body, and the bracket is provided with a first driving member for driving the roller to rotate; the guide rail is passed through the steel pipe body along the axial direction of the steel pipe body, and the spraying mechanism is used to spray the coating on the inner wall of the steel pipe body, and the spraying mechanism is slidably connected to the guide rail and moves along the length direction of the guide rail; the air blowing device is located behind the moving direction of the spraying mechanism, and is used to blow air on the coating on the inner wall of the steel pipe body in the moving direction of the spraying mechanism, so as to force the uncondensed coating protrusions on the inner wall surface of the steel pipe body to diffuse to the uncoated area of ​​the inner wall of the steel pipe body, so as to improve the coating spraying efficiency and flatness of the inner wall of the steel pipe.

Description

Technical Field

[0001] The present application relates to the field of steel pipe processing, and in particular to an automatic spraying machine for large-diameter anti-corrosion steel pipes and a working method thereof. Background Art

[0002] Galvanized steel pipe is a steel pipe made of cold-rolled galvanized strip steel as raw material, formed by cold bending and then high-frequency welding. It has the characteristics of strong protection and corrosion resistance. It can be used as a pipeline material for brackets, steel structure projects, and machinery manufacturing. It is widely used in fire protection, water supply and drainage, direct drinking water, air conditioning, gas and other fluid transportation pipeline projects.

[0003] The corrosion resistance of steel pipes mainly depends on the coating covering the inner and outer walls of the steel pipes. The steel pipe coating is usually composed of three layers. Among them, the epoxy powder is the innermost layer, which is in direct contact with the steel pipe and has high wear resistance and adhesion. The polyethylene is the outermost layer and has extremely high anti-corrosion performance, which plays a good protective role for the steel pipe. In addition, the adhesive is the middle layer, which plays the role of bonding the inner and outer layers, so that the epoxy powder layer and the polyethylene layer are closely combined, thereby better fitting on the steel pipe.

[0004] Regarding the above-mentioned related technologies, there are the following defects: in the actual steel pipe coating operation, the spraying work on the inner wall of the steel pipe is inconvenient. There are currently two methods. One is that the staff enters the steel pipe and sprays with a handheld spray gun. The coating efficiency of this method is low and the coating is uneven, or it is sprayed using a crawling spraying equipment. The spraying equipment moves along the inner wall of the steel pipe and fully covers the inner wall of the steel pipe. However, the problem of uneven coating is prone to occur. The main reason for the uneven coating is that the excess coating spray generated during the spraying process will fall and accumulate at the bottom of the inner wall of the steel pipe, thereby forming dense small bumps. The small bumps will not only affect the bonding between adjacent coatings, but also when the steel pipe is used as a drainage pipe, the water flow will have a greater impact on the raised position of the steel pipe coating, and there is a hidden danger of coating falling off. Therefore, there is still room for improvement. Summary of the Invention

[0005] In order to improve the coating spraying efficiency and smoothness of the inner wall of the steel pipe, the present application provides a large-diameter anti-corrosion steel pipe automatic spraying machine and its working method.

[0006] The present application provides an automatic spraying machine for large-diameter anti-corrosion steel pipes and a working method thereof, which adopts the following technical solutions:

[0007] An automatic spraying machine for large-diameter anti-corrosion steel pipes, comprising:

[0008] A base frame is provided with two groups of symmetrically distributed brackets, the brackets are rotatably connected to rollers, the rollers on the two brackets are used to jointly support the horizontally arranged steel pipe body, the axes of the rollers are parallel to the axis of the steel pipe body, and the brackets are provided with a first driving member for driving the rollers to rotate;

[0009] A guide rail is provided in the steel pipe body along the axial direction of the steel pipe body, and the base frame is provided with a mounting seat connected to the end of the guide rail;

[0010] A spraying mechanism, used for spraying a coating on the inner wall of the steel pipe body, wherein the spraying mechanism is slidably connected to the guide rail and moves along the length direction of the guide rail;

[0011] An air blast device is located behind the spray mechanism in the direction of travel and is used to blow air toward the coating on the inner wall of the steel pipe body in the direction of travel of the spray mechanism, so as to force the uncoated coating convex points on the inner wall surface of the steel pipe body to diffuse toward the uncoated area of ​​the inner wall of the steel pipe body;

[0012] The walking mechanism is used to drive the spraying mechanism and the blowing device to move synchronously.

[0013] By adopting the above technical solution, the base frame serves as the main supporting structure of the steel pipe body, and the rollers on the bracket are used to support and position the steel pipe body so that the steel pipe body is in a horizontal state to ensure that the guide rail is on the axis of the steel pipe body, so that the spraying distance from the spraying mechanism on the guide rail to the inner wall of the steel pipe body can be controlled, which is beneficial to improving the uniformity of spraying. The roller is driven to rotate by the first driving member, and the steel pipe body is driven to rotate by friction to realize spiral spraying. In addition, the air blowing device blows the coating on the inner wall of the steel pipe body behind the travel direction of the spraying mechanism, so that the flow direction of the air flow is consistent with the length direction of the steel pipe body, so as to force the uncondensed coating protrusions on the inner wall surface of the steel pipe body to diffuse to the uncoated area of ​​the inner wall of the steel pipe body, and under the drive of the walking mechanism, the air blowing device moves synchronously with the spraying mechanism, and the spraying operation is closely connected with the blowing operation to diffuse the coating protrusions in time, which is beneficial to overall improve the coating spraying efficiency and flatness of the inner wall of the steel pipe.

[0014] Preferably, the spraying mechanism includes a front end sliding cylinder slidingly sleeved on the outer periphery of the guide rail, a plurality of nozzles circumferentially distributed on the outer periphery of the front end sliding cylinder, and a feeding assembly for pumping coating raw materials to the plurality of nozzles, and the discharge ends of the plurality of nozzles radially extend to near the inner wall of the steel pipe body.

[0015] By adopting the above technical solution, the feeding assembly pumps the coating raw material to the nozzle, and the circumferentially distributed and radially extending nozzle sprays the coating raw material onto the inner wall of the steel pipe body at a close distance, thereby minimizing the distance over which the coating raw material flies, reducing the formation of large amounts of coating spray, and thereby reducing the probability of formation of coating bulges.

[0016] Preferably, the blowing device includes a rear end sliding cylinder slidably sleeved on the outer circumference of the guide rail, a plurality of blowing pipes circumferentially distributed on the outer circumference of the rear end sliding cylinder, and a blower for delivering airflow to the plurality of blowing pipes, the air outlet ends of the plurality of blowing pipes radially extend to the vicinity of the inner wall of the steel pipe main body and are inclined toward the inner wall of the steel pipe main body, and the angle between the inclination direction of the air outlet end of the blowing pipe and the length direction of the steel pipe main body is 10º~20º.

[0017] By adopting the above technical solution, the air outlet end of the blowing pipe is close to the steel pipe body and is slightly inclined, so that air can be blown to the blowing pipe by the blower and blown onto the coating protrusions on the inner wall of the steel pipe body. The air flow has a sweeping effect on the inner wall of the steel pipe body, so as to diffuse the coating protrusions, which is beneficial to improving the efficiency of removing the coating protrusions.

[0018] Preferably, the plurality of nozzles and the plurality of air blowing pipes are distributed at intervals in the projections on the radial plane of the steel pipe body.

[0019] By adopting the above technical solution, the plurality of nozzles and the plurality of air blowing pipes are staggered to avoid the airflow blown out of the air blowing pipe directly impacting the sprayed coating material of the nozzle, which is beneficial to reduce the impact of the blowing device on the normal spraying operation of the nozzle.

[0020] Preferably, the walking mechanism includes a sliding seat slidably sleeved on the outer periphery of the guide rail, a walking wheel rotatably connected to the sliding seat, and a second driving member for driving the walking wheel to rotate, and the sliding seat is located behind the travel direction of the blowing structure; under the drive of the second driving member, the walking wheel travels on the guide rail and drives the sliding seat to push the blowing device and the spraying mechanism forward.

[0021] By adopting the above technical solution, under the drive of the second driving member, the walking wheel travels on the guide rail and generates a forward thrust to drive the sliding seat to push the blowing device and the spraying mechanism forward, which is conducive to achieving the purpose of synchronous movement of the spraying mechanism and the blowing device.

[0022] Preferably, the front end sliding cylinder is rotatably connected to a fan blade and is provided with a third driving member for driving the fan blade to rotate. The fan blade is located in front of the travel direction of the spraying mechanism. The fan blade is driven to rotate by the third driving member to blow out the excess coating spray generated by the spraying mechanism to the outside of the pipe mouth of the steel pipe body.

[0023] By adopting the above technical solution, the fan blades are driven to rotate by the third driving member to form an airflow, and the excess coating spray generated by the spraying mechanism is carried out to the outside of the pipe mouth of the steel pipe body by the airflow, which is beneficial to reduce the probability of coating bulge formation.

[0024] Preferably, a support seat is provided at one end of the base frame away from the mounting seat, and one end of the guide rail away from the support seat passes through the support seat.

[0025] By adopting the above technical solution, the support seat and the mounting seat together serve as the support structure of the guide rail, and the load at the guide rail can be transferred to the support seat and the mounting seat, which is conducive to improving the stability of the guide rail.

[0026] A working method of an automatic spraying machine for large-diameter anti-corrosion steel pipes includes the following steps:

[0027] The first driving member is started, and the roller rotates under the drive of the first driving member, and drives the steel pipe body to rotate;

[0028] Start the traveling mechanism to drive the spraying mechanism and the air blowing device to move along the guide rail and enter from one end of the steel pipe body;

[0029] Start the spraying mechanism and the blowing device, the spraying mechanism sprays the coating on the inner wall of the steel pipe body, and the blowing device blows air on the coating on the inner wall of the steel pipe body in the direction of travel of the spraying mechanism, forcing the uncondensed coating convex points on the inner wall surface of the steel pipe body to diffuse to the uncoated area of ​​the inner wall of the steel pipe body. When the spraying mechanism and the blowing device are moved out from the other end of the steel pipe body, the coating work on the inner wall of the steel pipe body is completed.

[0030] By adopting the above technical solution, the roller is driven to rotate by the first driving member, and the steel pipe body is driven to rotate by friction to realize spiral spraying. The air blowing device blows the coating on the inner wall of the steel pipe body behind the travel direction of the spraying mechanism, so that the flow direction of the air flow is consistent with the length direction of the steel pipe body, so as to force the uncondensed coating protrusions on the inner wall surface of the steel pipe body to diffuse to the uncoated area of ​​the inner wall of the steel pipe body, and under the drive of the traveling mechanism, the air blowing device moves synchronously with the spraying mechanism, and the spraying operation is closely connected with the blowing operation, so as to diffuse the coating protrusions in time, which is beneficial to improve the overall spraying efficiency and flatness of the coating on the inner wall of the steel pipe.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. The roller is driven to rotate by the first driving member, and the steel pipe body is driven to rotate by friction to realize spiral spraying. In addition, the air blowing device blows the coating on the inner wall of the steel pipe body behind the traveling direction of the spraying mechanism, so that the flow direction of the air flow is consistent with the length direction of the steel pipe body, so as to force the uncondensed coating convex points on the inner wall surface of the steel pipe body to diffuse to the uncoated area of ​​the inner wall of the steel pipe body. Driven by the traveling mechanism, the air blowing device moves synchronously with the spraying mechanism, and the spraying operation is closely connected with the blowing operation, so as to diffuse the coating convex points in time, which is conducive to improving the overall coating spraying efficiency and flatness of the inner wall of the steel pipe.

[0033] 2. By placing the air outlet end of the air blowing pipe close to the steel pipe body and tilting it at an angle of 10° to 20° toward the inner wall of the steel pipe body, the blower can blow air into the air blowing pipe and blow the coating bumps on the inner wall of the steel pipe body. The airflow forms an airflow with a sweeping effect on the inner wall of the steel pipe body, thereby diffusing the coating bumps and improving the efficiency of removing the coating bumps.

[0034] 3. By arranging fan blades at the front end of the spraying mechanism, the fan blades rotate and create airflow under the drive of the third driving member. The airflow carries the excess coating spray generated by the spraying mechanism out of the pipe mouth of the steel pipe body, which is beneficial to reduce the probability of coating bulge formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the three-dimensional structure of an automatic spraying machine for large-diameter anti-corrosion steel pipes inside the steel pipe body according to an embodiment of the present application.

[0036] Figure 2 yes Figure 1 Enlarged schematic diagram of point A in the middle.

[0037] Figure 3 This is a schematic diagram of the planar structure of an automatic spraying machine for large-diameter anti-corrosion steel pipes inside the steel pipe body according to an embodiment of the present application.

[0038] Figure 4 This is a schematic diagram of the distribution of the nozzle and the air blowing pipe in an automatic spraying machine for large-diameter anti-corrosion steel pipes in an embodiment of the present application.

[0039] Explanation of the accompanying drawings: 1. Base frame; 11. Bracket; 12. Roller; 13. First driving member; 2. Steel pipe body; 3. Mounting seat; 4. Support seat; 41. Exhaust port; 5. Guide rail; 6. Fan blade; 61. Third driving member; 7. Spraying mechanism; 71. Feeding assembly; 72. Nozzle; 73. Front sliding cylinder; 8. Blowing device; 81. Blower; 82. Blowing pipe; 83. Rear sliding cylinder; 9. Walking mechanism; 91. Sliding seat; 92. Walking wheel. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-4 This application is described in further detail.

[0041] The present application discloses an automatic spraying machine for large-diameter anti-corrosion steel pipes. Figure 1 ,include:

[0042] The base frame 1, in this embodiment, is horizontally arranged and has two sets of symmetrically distributed brackets 11 fixedly mounted on its upper surface. The brackets 11 are rotatably connected to rollers 12. The rollers 12 on the two brackets 11 are used to jointly support the horizontally arranged steel pipe body 2. The rollers 12 on the brackets 11 support and position the steel pipe body 2 so that the steel pipe body 2 is in a horizontal state. In actual application, the number of brackets 11 and rollers 12 can be increased according to the length of the steel pipe body 2 to improve the stability of the steel pipe body 2. The axis of the roller 12 is parallel to the axis of the steel pipe body 2. The bracket 11 is equipped with a first driving member 13 for driving the roller 12 to rotate. The first driving member 13 is specifically a first motor. The output shaft of the first motor is coaxially connected to the roller 12. The roller 12 is driven to rotate by the first driving member 13, and the steel pipe body 2 is driven to rotate by friction, thereby realizing the self-rotation function of the steel pipe body 2. In order to further limit the steel pipe body 2, a mounting seat 3 is installed at one end of the base frame 1, and a support seat 4 is arranged at the other end of the base frame 1. The mounting seat 3 and the support seat 4 respectively abut against the pipe mouth of the steel pipe body 2.

[0043] The guide rail 5, in this embodiment, is provided along the axis of the steel pipe body 2 and extends through the steel pipe body 2. One end of the guide rail 5 is fixed to the mounting seat 3, and the other end extends through the support seat 4, thereby improving the overall stability of the guide rail 5. The support seat 4 is a movable structure so that the support seat 4 can be used to limit the position of the steel pipe body 2 after it is placed on the rollers 12.

[0044] Reference Figure 2 and Figure 3, spraying mechanism 7, in this embodiment, the spraying mechanism 7 is used to spray the coating on the inner wall of the steel pipe body 2, and the spraying mechanism 7 is slidably connected to the guide rail 5 and moves along the length direction of the guide rail 5 to cooperate with the self-rotation of the steel pipe body 2 to realize the spiral spraying of the inner wall of the steel pipe body 2, which is conducive to improving the spraying uniformity of the spraying mechanism 7. Specifically, the spraying mechanism 7 includes a front end sliding cylinder 73 slidably sleeved on the outer periphery of the guide rail 5, a plurality of nozzles 72 circumferentially distributed on the outer periphery of the front end sliding cylinder 73, and a feeding assembly 71 for pumping the coating raw material to the plurality of nozzles 72, and the discharge ends of the plurality of nozzles 72 radially extend to the vicinity of the inner wall of the steel pipe body 2, thereby minimizing the distance of the coating raw material flying as much as possible, reducing the situation of large-scale formation of coating spray, and thereby reducing the probability of formation of coating convex points. Among them, the feeding assembly 71 includes a storage box for storing coating raw materials, a pump body connected to the storage box, and a connecting pipe connected to the output end of the pump body. The connecting pipe is connected to a number of nozzles 72, so as to facilitate pumping the coating raw materials in the storage box to the nozzles 72 and spraying them out.

[0045] The blowing device 8, in this embodiment, is installed at the rear of the traveling direction of the spraying mechanism 7. Specifically, the blowing device 8 includes a rear end sliding cylinder 83 that is slidably sleeved on the outer periphery of the guide rail 5, a plurality of blowing pipes 82 that are circumferentially distributed on the outer periphery of the rear end sliding cylinder 83, and a blower 81 for delivering airflow to the plurality of blowing pipes 82. The outlet ports of the blowing pipes 82 are widened to increase the coverage area of ​​the blowing. The outlet ports of the plurality of blowing pipes 82 radially extend to the vicinity of the inner wall of the steel pipe body 2 and are inclined toward the inner wall of the steel pipe body 2. The outlet port main body direction of the blowing pipe 82 is consistent with the traveling direction of the spraying mechanism 7 to form an airflow to the steel pipe. The air flow flows in the direction of the pipe mouth of the main body 2, and the angle between the inclined direction of the air outlet end of the blowing pipe 82 and the length direction of the steel pipe main body 2 is 10º~20º, so that the air flow can flow along the inner wall of the steel pipe main body 2. The air flow has a sweeping effect on the inner wall of the steel pipe main body 2, and the coating on the inner wall of the steel pipe main body 2 is blown by the blowing device 8 in the direction of travel of the spraying mechanism 7, thereby forcing the uncondensed coating protrusions on the inner wall surface of the steel pipe main body 2 to diffuse to the uncoated area of ​​the inner wall of the steel pipe main body 2, which is beneficial to improve the removal efficiency of the coating protrusions.

[0046] The walking mechanism 9, in this embodiment, includes a sliding seat 91 that is slidably sleeved on the outer periphery of the guide rail 5, a walking wheel 92 that is rotatably connected to the sliding seat 91, and a second driving member (not shown in the figure) for driving the walking wheel 92 to rotate. The second driving member is specifically a second motor embedded in the sliding seat 91, and the conveying shaft of the second motor is coaxially connected to the walking wheel 92. The sliding seat 91 is located at the rear of the blowing structure in the direction of travel. In this embodiment, the sliding seat 91 is detachably connected to the rear end sliding cylinder 83, and the rear end sliding cylinder 83 is detachably connected to the front end sliding cylinder 73. Therefore, under the drive of the second driving member, the walking wheel 92 travels on the guide rail 5 and drives the sliding seat 91 to push the rear end sliding cylinder 83 of the blowing device 8 and the front end sliding cylinder 73 of the spraying mechanism 7 forward, thereby realizing the function of the walking mechanism 9 driving the spraying mechanism 7 and the blowing device 8 to move synchronously.

[0047] In this embodiment, in order to improve the structural compactness of the spraying machine, the material storage box of the spraying mechanism 7 and the blower 81 of the blowing device 8 are both installed on the sliding seat 91.

[0048] Reference Figure 2 and Figure 4 In order to reduce the influence of the air blowing device 8 on the spraying work of the spraying mechanism 7, the position distribution of the nozzle 72 and the air blowing pipe 82 is designed, and a plurality of nozzles 72 and a plurality of air blowing pipes 82 are distributed at intervals in the projection of the radial plane of the steel pipe body 2, so that the plurality of nozzles 72 and the plurality of air blowing pipes 82 are staggered with each other to avoid the air flow blown out of the air blowing pipe 82 directly impacting the sprayed coating raw material of the nozzle 72, which is beneficial to reduce the influence of the air blowing device 8 on the normal spraying work of the nozzle 72.

[0049] Reference Figure 2 and Figure 3 In order to facilitate the timely removal of the coating spray generated by the spraying mechanism 7, a fan blade 6 is rotatably connected to the front sliding cylinder 73 and a third driving member 61 is installed to drive the fan blade 6 to rotate. Among them, the fan blade 6 is located in front of the travel direction of the spraying mechanism 7. The third driving member 61 specifically includes an inner gear ring installed on the inner ring of the fan blade 6, a gear meshing with the inner gear ring, and a third motor embedded in the front sliding cylinder 73. The output shaft of the third motor is coaxially connected to the gear. The axis of the fan blade 6 coincides with the length direction of the guide rail 5. The fan blade 6 is driven to rotate by the third driving member 61, thereby blowing the excess coating spray generated by the spraying mechanism 7 out of the pipe mouth of the steel pipe body 2.

[0050] Reference Figure 1 and Figure 2In this embodiment, the mounting base 3 is the starting point of the spray mechanism 7 and the air blowing device 8, and the support base 4 is the end point. Therefore, the mounting base 3 and the support base 4 are both provided with a receiving groove on the side facing each other. The receiving groove is used to accommodate the spray mechanism 7, the air blowing device 8 and the traveling mechanism 9. This does not affect the position limitation of the support base 4 and the mounting base 3 on the steel pipe body 2, and can also enable the working range of the spray mechanism 7 and the air blowing device 8 to cover the entire inner wall of the steel pipe body 2.

[0051] A working method of an automatic spraying machine for large-diameter anti-corrosion steel pipes, comprising the following steps:

[0052] The first driving member 13 is started, and the roller 12 is driven by the first driving member 13 to rotate, thereby driving the steel pipe body 2 to rotate.

[0053] Start the second driving part of the walking mechanism 9, the walking wheel 92 moves on the guide rail 5 and forms a forward thrust to drive the sliding seat 91 to push the rear end sliding cylinder 83 of the blowing device 8 and the front end sliding cylinder 73 of the spraying mechanism 7 forward, and the spraying mechanism 7, the blowing device 8 and the walking mechanism 9 drive out of the accommodating groove in the mounting seat 3, move along the guide rail 5 and enter from one end of the steel pipe body 2.

[0054] The spray mechanism 7 and the air blowing device 8 are started, and the feed assembly 71 of the spray mechanism 7 pumps the coating raw material to the nozzle 72 and sprays it out, cooperating with the self-rotation of the steel pipe body 2 to realize the spiral spraying of the inner wall of the steel pipe body 2. At the same time, the air blowing pipe 82 of the air blowing device 8 blows air toward the coating on the inner wall of the steel pipe body 2 in the direction of travel of the spray mechanism 7 to form an air flow flowing toward the pipe mouth of the steel pipe body 2. The air flow can flow along the inner wall of the steel pipe body 2, and the air flow has a sweeping effect on the inner wall of the steel pipe body 2, forcing the uncondensed coating protrusions on the inner wall surface of the steel pipe body 2 to diffuse to the uncoated area of ​​the inner wall of the steel pipe body 2, so as to improve the efficiency of removing the coating protrusions.

[0055] Start the third driving member 61, and drive the fan blade 6 to rotate through the third driving member 61, so that the excess coating spray generated by the spraying mechanism 7 is blown out to the outside of the pipe mouth of the steel pipe body 2. Since the pipe mouth of the steel pipe body 2 is blocked by the support seat 4, an exhaust port 41 is opened at the support seat 4 to facilitate the smooth removal of the coating spray.

[0056] When the spraying mechanism 7 and the blowing device 8 are moved out from the other end of the steel pipe body 2 and enter the receiving groove of the support seat 4 at the same time, the coating work on the inner wall of the steel pipe body 2 is finally completed.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An automatic spraying machine for large-diameter anti-corrosion steel pipes, characterized in that: include: A base frame (1), wherein the base frame (1) is provided with two groups of symmetrically distributed brackets (11), the brackets (11) are rotatably connected to rollers (12), the rollers (12) on the two brackets (11) are used to jointly support a horizontally arranged steel pipe body (2), the axes of the rollers (12) are parallel to the axis of the steel pipe body (2), and the brackets (11) are provided with a first driving member (13) for driving the rollers (12) to rotate; A guide rail (5), the guide rail (5) being passed through the steel pipe body (2) along the axial direction of the steel pipe body (2), and the base frame (1) being provided with a mounting seat (3) connected to the end of the guide rail (5); A spraying mechanism (7) is used for spraying a coating on the inner wall of the steel pipe body (2), wherein the spraying mechanism (7) is slidably connected to the guide rail (5) and moves along the length direction of the guide rail (5); an air blowing device (8), the air blowing device (8) being located behind the travel direction of the spraying mechanism (7) and being used to blow air toward the coating on the inner wall of the steel pipe body (2) in the travel direction of the spraying mechanism (7), so as to force the uncoated coating convex points on the inner wall surface of the steel pipe body (2) to diffuse toward the uncoated area of ​​the inner wall of the steel pipe body (2); A walking mechanism (9), the walking mechanism (9) is used to drive the spraying mechanism (7) and the blowing device (8) to move synchronously; The walking mechanism (9) comprises a sliding seat (91) slidably sleeved on the outer periphery of the guide rail (5), a walking wheel (92) rotatably connected to the sliding seat (91), and a second driving member for driving the walking wheel (92) to rotate, wherein the sliding seat (91) is located behind the direction of travel of the blowing device (8); under the drive of the second driving member, the walking wheel (92) travels on the guide rail (5) and drives the sliding seat (91) to push the blowing device (8) and the spraying mechanism (7) forward; The spraying mechanism (7) comprises a front sliding cylinder (73) slidably sleeved on the outer periphery of the guide rail (5), a plurality of nozzles (72) circumferentially distributed on the outer periphery of the front sliding cylinder (73), and a feeding assembly (71) for pumping coating raw materials to the plurality of nozzles (72), wherein the discharge ends of the plurality of nozzles (72) radially extend to the vicinity of the inner wall of the steel pipe body (2); The front sliding cylinder (73) is rotatably connected to a fan blade (6) and is provided with a third driving member (61) for driving the fan blade (6) to rotate, and the fan blade (6) is located in front of the travel direction of the spraying mechanism (7); A support seat (4) is provided at one end of the base frame (1) away from the mounting seat (3), and an end of the guide rail (5) away from the support seat (4) passes through the support seat (4). The fan blade (6) is driven to rotate by the third driving member (61) to blow the excess coating spray generated by the spraying mechanism (7) out of the pipe mouth of the steel pipe body (2). The pipe mouth of the steel pipe body (2) is blocked by the support seat (4), and an exhaust port (41) is provided at the support seat (4) to facilitate the smooth discharge of the coating spray; The blowing device (8) comprises a rear end sliding cylinder (83) slidably sleeved on the outer periphery of the guide rail (5), a plurality of blowing pipes (82) circumferentially distributed on the outer periphery of the rear end sliding cylinder (83), and a blower (81) for conveying airflow to the plurality of blowing pipes (82), wherein the air outlet ends of the plurality of blowing pipes (82) radially extend to the vicinity of the inner wall of the steel pipe body (2) and are inclined toward the inner wall of the steel pipe body (2), and the angle between the inclined direction of the air outlet end of the blowing pipe (82) and the length direction of the steel pipe body (2) is 10° to 20°.

2. The large-diameter anti-corrosion steel pipe automatic spraying machine according to claim 1 is characterized in that: The plurality of nozzles (72) and the plurality of air blowing pipes (82) are distributed at intervals in the projection of the steel pipe body (2) in the radial plane.

3. A method for operating the large-diameter anti-corrosion steel pipe automatic spraying machine according to claim 1, characterized in that: The following steps are involved: The first driving member (13) is started, and the roller (12) is driven by the first driving member (13) to rotate, thereby driving the steel pipe body (2) to rotate; Start the traveling mechanism (9), drive the spraying mechanism (7) and the blowing device (8) to move along the guide rail (5) and enter from one end of the steel pipe body (2); The spraying mechanism (7) and the air blowing device (8) are started, the spraying mechanism (7) sprays the coating on the inner wall of the steel pipe body (2), and the air blowing device (8) blows air toward the coating on the inner wall of the steel pipe body (2) in the direction of travel of the spraying mechanism (7), forcing the uncondensed coating convex points on the inner wall surface of the steel pipe body (2) to diffuse toward the uncoated area of ​​the inner wall of the steel pipe body (2). When the spraying mechanism (7) and the air blowing device (8) are moved out from the other end of the steel pipe body (2), the coating work on the inner wall of the steel pipe body (2) is completed.

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